linux-kernel - [PATCH 18/20] video: msm: Prevent DMA lockups when switching bit depths

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Message-Id: <1300485585-27640-1-git-send-email-carlv@codeaurora.org>
Date:	Fri, 18 Mar 2011 14:59:45 -0700
From:	Carl Vanderlip <carlv@...eaurora.org>
To:	David Brown <davidb@...eaurora.org>,
	Daniel Walker <dwalker@...o99.com>,
	Bryan Huntsman <bryanh@...eaurora.org>
Cc:	Brian Swetland <swetland@...gle.com>,
	Dima Zavin <dima@...roid.com>,
	Rebecca Schultz Zavin <rebecca@...roid.com>,
	Colin Cross <ccross@...roid.com>, linux-fbdev@...r.kernel.org,
	Carl Vanderlip <carlv@...eaurora.org>,
	linux-arm-kernel@...ts.infradead.org,
	linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 18/20] video: msm: Prevent DMA lockups when switching bit depths

Forces the lcdc off and waits a frame vsync period to prevent the MDP DMA
engine crashing if the DMA bit depth is changed.  A sleep cannot be used
because lcdc_dma_start is called in irq context.

Authors:
Dima Zavin <dima@...roid.com>
Rebecca Schultz Zavin <rebecca@...roid.com>
Colin Cross <ccross@...roid.com>

Signed-off-by: Carl Vanderlip <carlv@...eaurora.org>
---
 drivers/video/msm/mdp.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/drivers/video/msm/mdp.c b/drivers/video/msm/mdp.c
index b3f334ad..49d956a 100644
--- a/drivers/video/msm/mdp.c
+++ b/drivers/video/msm/mdp.c
@@ -564,6 +564,13 @@ void mdp_hw_init(struct mdp_info *mdp)
 	mdp_writel(mdp, 1, 0x60);
 	mdp_writel(mdp, 1, MDP_EBI2_PORTMAP_MODE);
 
+	/* disable lcdc */
+	mdp_writel(mdp, 0, MDP_LCDC_CTL);
+	/* enable auto clock gating for all blocks by default */
+	mdp_writel(mdp, 0xffffffff, MDP_CGC_EN);
+	/* reset color/gamma correct parms */
+	mdp_writel(mdp, 0, MDP_DMA_P_COLOR_CORRECT_CONFIG);
+
 	mdp_writel(mdp, 0, MDP_CMD_DEBUG_ACCESS_BASE + 0x01f8);
 	mdp_writel(mdp, 0, MDP_CMD_DEBUG_ACCESS_BASE + 0x01fc);
 	mdp_writel(mdp, 1, 0x60);
-- 
Sent by an employee of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.

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